github - ghsa-3vrh-9v2m-f8xc

GHSA-3VRH-9V2M-F8XC

Vulnerability from github – Published: 2025-06-18 12:30 – Updated: 2025-11-14 18:31

Details

In the Linux kernel, the following vulnerability has been resolved:

xen/privcmd: fix error exit of privcmd_ioctl_dm_op()

The error exit of privcmd_ioctl_dm_op() is calling unlock_pages() potentially with pages being NULL, leading to a NULL dereference.

Additionally lock_pages() doesn't check for pin_user_pages_fast() having been completely successful, resulting in potentially not locking all pages into memory. This could result in sporadic failures when using the related memory in user mode.

Fix all of that by calling unlock_pages() always with the real number of pinned pages, which will be zero in case pages being NULL, and by checking the number of pages pinned by pin_user_pages_fast() matching the expected number of pages.

Severity ?

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49989"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-06-18T11:15:26Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxen/privcmd: fix error exit of privcmd_ioctl_dm_op()\n\nThe error exit of privcmd_ioctl_dm_op() is calling unlock_pages()\npotentially with pages being NULL, leading to a NULL dereference.\n\nAdditionally lock_pages() doesn\u0027t check for pin_user_pages_fast()\nhaving been completely successful, resulting in potentially not\nlocking all pages into memory. This could result in sporadic failures\nwhen using the related memory in user mode.\n\nFix all of that by calling unlock_pages() always with the real number\nof pinned pages, which will be zero in case pages being NULL, and by\nchecking the number of pages pinned by pin_user_pages_fast() matching\nthe expected number of pages.",
  "id": "GHSA-3vrh-9v2m-f8xc",
  "modified": "2025-11-14T18:31:23Z",
  "published": "2025-06-18T12:30:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49989"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/45d47bd9b96e7874b98dbcc7602fe2826c5d62a6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6de50db104af0dc921f593fd95c55db86a52ceef"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c2b7bae7c90051fd6a679d5dee00400d67ebbf4a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c5deb27895e017a0267de0a20d140ad5fcc55a54"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2022-49989 (GCVE-0-2022-49989)

Vulnerability from cvelistv5 – Published: 2025-06-18 11:00 – Updated: 2025-06-18 11:00

Summary

In the Linux kernel, the following vulnerability has been resolved: xen/privcmd: fix error exit of privcmd_ioctl_dm_op() The error exit of privcmd_ioctl_dm_op() is calling unlock_pages() potentially with pages being NULL, leading to a NULL dereference. Additionally lock_pages() doesn't check for pin_user_pages_fast() having been completely successful, resulting in potentially not locking all pages into memory. This could result in sporadic failures when using the related memory in user mode. Fix all of that by calling unlock_pages() always with the real number of pinned pages, which will be zero in case pages being NULL, and by checking the number of pages pinned by pin_user_pages_fast() matching the expected number of pages.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/6de50db104af0dc92…
	https://git.kernel.org/stable/c/c2b7bae7c90051fd6…
	https://git.kernel.org/stable/c/45d47bd9b96e7874b…
	https://git.kernel.org/stable/c/c5deb27895e017a02…

Impacted products

Vendor

Product

Version

Linux

Affected: ab520be8cd5d56867fc95cfbc34b90880faf1f9d , < 6de50db104af0dc921f593fd95c55db86a52ceef (git)
Affected: ab520be8cd5d56867fc95cfbc34b90880faf1f9d , < c2b7bae7c90051fd6a679d5dee00400d67ebbf4a (git)
Affected: ab520be8cd5d56867fc95cfbc34b90880faf1f9d , < 45d47bd9b96e7874b98dbcc7602fe2826c5d62a6 (git)
Affected: ab520be8cd5d56867fc95cfbc34b90880faf1f9d , < c5deb27895e017a0267de0a20d140ad5fcc55a54 (git)

Linux

Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 5.10.140 , ≤ 5.10.* (semver)
Unaffected: 5.15.64 , ≤ 5.15.* (semver)
Unaffected: 5.19.6 , ≤ 5.19.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/xen/privcmd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "status": "affected",
              "version": "ab520be8cd5d56867fc95cfbc34b90880faf1f9d",
              "versionType": "git"
            },
            {
              "lessThan": "c2b7bae7c90051fd6a679d5dee00400d67ebbf4a",
              "status": "affected",
              "version": "ab520be8cd5d56867fc95cfbc34b90880faf1f9d",
              "versionType": "git"
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            {
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        },
        {
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          "product": "Linux",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.11"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.140",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.64",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.140",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
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                }
              ],
              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxen/privcmd: fix error exit of privcmd_ioctl_dm_op()\n\nThe error exit of privcmd_ioctl_dm_op() is calling unlock_pages()\npotentially with pages being NULL, leading to a NULL dereference.\n\nAdditionally lock_pages() doesn\u0027t check for pin_user_pages_fast()\nhaving been completely successful, resulting in potentially not\nlocking all pages into memory. This could result in sporadic failures\nwhen using the related memory in user mode.\n\nFix all of that by calling unlock_pages() always with the real number\nof pinned pages, which will be zero in case pages being NULL, and by\nchecking the number of pages pinned by pin_user_pages_fast() matching\nthe expected number of pages."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T11:00:50.126Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/c5deb27895e017a0267de0a20d140ad5fcc55a54"
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      ],
      "title": "xen/privcmd: fix error exit of privcmd_ioctl_dm_op()",
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    "cveId": "CVE-2022-49989",
    "datePublished": "2025-06-18T11:00:50.126Z",
    "dateReserved": "2025-06-18T10:57:27.386Z",
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    "state": "PUBLISHED"
  },
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}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-3VRH-9V2M-F8XC

CVE-2022-49989 (GCVE-0-2022-49989)

Tags

Sightings

Nomenclature